Controls on Greenland moulin geometry and evolution from the Moulin Shape model
Nearly all meltwater from glaciers and ice sheets is routed englacially through moulins. Therefore, the geometry and evolution of moulins has the potential to influence subglacial water pressure variations, ice motion, and the runoff hydrograph delivered to the ocean. We develop the Moulin Shape (Mo...
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Copernicus Publications
2022
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00061617 2023-05-15T16:29:20+02:00 Controls on Greenland moulin geometry and evolution from the Moulin Shape model Andrews, Lauren C. Poinar, Kristin Trunz, Celia 2022-06 electronic https://doi.org/10.5194/tc-16-2421-2022 https://noa.gwlb.de/receive/cop_mods_00061617 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061052/tc-16-2421-2022.pdf https://tc.copernicus.org/articles/16/2421/2022/tc-16-2421-2022.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-2421-2022 https://noa.gwlb.de/receive/cop_mods_00061617 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061052/tc-16-2421-2022.pdf https://tc.copernicus.org/articles/16/2421/2022/tc-16-2421-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/tc-16-2421-2022 2022-06-26T23:11:40Z Nearly all meltwater from glaciers and ice sheets is routed englacially through moulins. Therefore, the geometry and evolution of moulins has the potential to influence subglacial water pressure variations, ice motion, and the runoff hydrograph delivered to the ocean. We develop the Moulin Shape (MouSh) model, a time-evolving model of moulin geometry. MouSh models ice deformation around a moulin using both viscous and elastic rheologies and melting within the moulin through heat dissipation from turbulent water flow, both above and below the water line. We force MouSh with idealized and realistic surface melt inputs. Our results show that, under realistic surface melt inputs, variations in surface melt change the geometry of a moulin by approximately 10 % daily and over 100 % seasonally. These size variations cause observable differences in moulin water storage capacity and moulin water levels compared to a static, cylindrical moulin. Our results suggest that moulins are important storage reservoirs for meltwater, with storage capacity and water levels varying over multiple timescales. Implementing realistic moulin geometry within subglacial hydrologic models may therefore improve the representation of subglacial pressures, especially over seasonal periods or in regions where overburden pressures are high. Article in Journal/Newspaper Greenland The Cryosphere Niedersächsisches Online-Archiv NOA Greenland The Cryosphere 16 6 2421 2448 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Andrews, Lauren C. Poinar, Kristin Trunz, Celia Controls on Greenland moulin geometry and evolution from the Moulin Shape model |
topic_facet |
article Verlagsveröffentlichung |
description |
Nearly all meltwater from glaciers and ice sheets is routed englacially through moulins. Therefore, the geometry and evolution of moulins has the potential to influence subglacial water pressure variations, ice motion, and the runoff hydrograph delivered to the ocean. We develop the Moulin Shape (MouSh) model, a time-evolving model of moulin geometry. MouSh models ice deformation around a moulin using both viscous and elastic rheologies and melting within the moulin through heat dissipation from turbulent water flow, both above and below the water line. We force MouSh with idealized and realistic surface melt inputs. Our results show that, under realistic surface melt inputs, variations in surface melt change the geometry of a moulin by approximately 10 % daily and over 100 % seasonally. These size variations cause observable differences in moulin water storage capacity and moulin water levels compared to a static, cylindrical moulin. Our results suggest that moulins are important storage reservoirs for meltwater, with storage capacity and water levels varying over multiple timescales. Implementing realistic moulin geometry within subglacial hydrologic models may therefore improve the representation of subglacial pressures, especially over seasonal periods or in regions where overburden pressures are high. |
format |
Article in Journal/Newspaper |
author |
Andrews, Lauren C. Poinar, Kristin Trunz, Celia |
author_facet |
Andrews, Lauren C. Poinar, Kristin Trunz, Celia |
author_sort |
Andrews, Lauren C. |
title |
Controls on Greenland moulin geometry and evolution from the Moulin Shape model |
title_short |
Controls on Greenland moulin geometry and evolution from the Moulin Shape model |
title_full |
Controls on Greenland moulin geometry and evolution from the Moulin Shape model |
title_fullStr |
Controls on Greenland moulin geometry and evolution from the Moulin Shape model |
title_full_unstemmed |
Controls on Greenland moulin geometry and evolution from the Moulin Shape model |
title_sort |
controls on greenland moulin geometry and evolution from the moulin shape model |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-2421-2022 https://noa.gwlb.de/receive/cop_mods_00061617 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061052/tc-16-2421-2022.pdf https://tc.copernicus.org/articles/16/2421/2022/tc-16-2421-2022.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland The Cryosphere |
genre_facet |
Greenland The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-2421-2022 https://noa.gwlb.de/receive/cop_mods_00061617 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061052/tc-16-2421-2022.pdf https://tc.copernicus.org/articles/16/2421/2022/tc-16-2421-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-16-2421-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
6 |
container_start_page |
2421 |
op_container_end_page |
2448 |
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